getDocuments

Returns a list of Documents representing the specified Resource (empty when no such Document exists yet). Each
document represent a set of statements with the specified Resource as a subject, which are stored in a specific
context

commit

Commits any changes done to the LuceneIndex since the last commit. The semantics is synchronous to
SailConnection.commit(), i.e. the LuceneIndex should be committed/rollbacked whenever the LuceneSailConnection is
committed/rollbacked.